Both Ctrl keys now working.

As the title says, both of my control keys are not functioning - and this is more than driving me insane. I have, so far, checked for new driver updates, as well as reinstalling my keyboard driver, to no success.

The on screen keyboard, when I toggle control, does work. Likewise, when tested on this site (http://en.key-test.ru/ all keys apart from control seem to work.

I am using an ASUS laptop (X540L), and my current Windows version is Windows 10 - Version 1803 (OS Build 17134.285)

As far as I know, I haven't introduced any changes worth noting that would cause this. I am beyond stressed, as this is slowing my work significantly. Any comments would be of help!